Diesel engines for land and marine work . Fig. 1G8.—Diesel Engine Indicator Diagram with Valve Scavenging.] 331 ^^abaat yi. r?i/ Fig 169. —Diagram of Engine with Port Scavengi332 mg. THE DESIGN OF DIESEL ENGINES 333 engines, up to say 300 or 400 per cylinder, thisratio with valve scavenging at the motors is about 0-8,although it decreases in larger motors. Turning now to Fig. 169, which represents an engine inwhich port scavenging is adopted, as before fuel is injectedat c and combustion takes place along cb, expansion follow-ing along ha down to a ; the piston then uncovers the exhaust
Diesel engines for land and marine work . Fig. 1G8.—Diesel Engine Indicator Diagram with Valve Scavenging.] 331 ^^abaat yi. r?i/ Fig 169. —Diagram of Engine with Port Scavengi332 mg. THE DESIGN OF DIESEL ENGINES 333 engines, up to say 300 or 400 per cylinder, thisratio with valve scavenging at the motors is about 0-8,although it decreases in larger motors. Turning now to Fig. 169, which represents an engine inwhich port scavenging is adopted, as before fuel is injectedat c and combustion takes place along cb, expansion follow-ing along ha down to a ; the piston then uncovers the exhaustports and allows the pressure of the exhaust gases to dropuntil e, when the scavenging air enters through the ports inthe other half of the cylinder now being uncovered by thepiston. In order to avoid any back pressure and conse-quent flowing back of the exhaust gases into the scavengepipe it is necessary that the pressure of the exhaust gasesshould drop in this way, although it is found that thescavenge ports may open whilst the pressure in the cylinderis still about 2 lb. per sq. inch above atmospheric. Frome to /
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkdvannostran
